US4323633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
UV-Absorbing compounds and photographic elements containing them
Assignee: 3M Co
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Filing: 1980-11-13
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Granted: 1982-04-06
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Expires: 2000-11-13
Abstract
Abstract It is desirable to protect color photographic dye images from ultraviolet radiation which tends to cause dyes to fade. It has been the practice in the art to add materials into or above the silver halide emulsions which will absorb ultraviolet radiation but allow transmission of visible radiation. One of the best classes of compounds are the 2-(2'-hydroxyphenyl)-benzotriazoles. These materials absorb ultraviolet radiation well, but tend to have poor solubility, crystallize out of the coating solution and emulsion, and diffuse through the photographic element. A novel class of substituted 2-(2'-hydroxyphenyl)-benzotriazoles has been found to reduce many of these problems.
Inventors
- 👤 Paolo Beretta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:55
CPC Classifications
C; C07; C07D; C07D249/00; C07D249/16; C07D249/18; C07D249/20; G; G03; G03C; G03C1/00; G03C1/76; G03C1/815; G03C1/8155; Y; Y10; Y10S; Y10S430/00; Y10S430/132
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
66 words
A photographic element comprising a support, at least one silver halide photographic emulsion layer and at least one auxiliary layer, said photographic element being characterized by having in at least one of said silver halide emulsion layer and said auxiliary layer an ultraviolet radiation absorbing 2-(2'-hydroxyphenyl)-benzotriazole compound having two butyl groups attached to the 2'-hydroxyphenyl nucleus and a third butyl group attached to the benzotriazole nucleus.
Claim 2
Dependent Claim
66 words
A photographic element comprising a support, at least one silver halide photographic emulsion layer and at least one auxiliary layer, said photographic element being characterized by having in at least one of said silver halide emulsion layer and said auxiliary layer an ultraviolet radiation absorbing 2-(2'-hydroxyphenyl)-benzotriazole compound having two butyl groups attached to the 2'-hydroxyphenyl nucleus and a third butyl group attached to the benzotriazole nucleus.
Claim 3
Dependent Claim
17 words
A photographic element according to claim 1, in which the compound is included in said auxiliary layer.
Claim 4
Dependent Claim
17 words
A photographic element according to claim 1, in which the compound is included in said emulsion layer.
Claim 5
Dependent Claim
41 words
The photograhic element of claim 1 wherein said two butyl groups are attached to the 3' and 5' positions of the 2'-hydroxyphenyl nucleus and said third butyl group is attached to either the 5 or 6 position of the benzotriazole nucleus.
Claim 6
Dependent Claim
14 words
The photographic element of claim 4 wherein said ultraviolet radiation absorbing compound is 2-(2'-hydroxy-3',5'-ditert.-butylphenyl)-5-n-butyl-benzotriazole.
Claim 7
Dependent Claim
14 words
The photographic element of claim 4 wherein said ultraviolet radiation absorbing compound is 2-(2'-hydroxy-3'-sec.-butyl-5'-tert.-butylphenyl)-5-n-butyl-benzotriazole.
Claim 8
Dependent Claim
14 words
The photographic element of claim 4 wherein said ultraviolet radiation absorbing compound is 2-(2'-hydroxy-3'-sec.-butyl-5'-tert.-butyl-phenyl)-5-tert.-butyl-benzotriazole.
Claim 9
Dependent Claim
14 words
The photographic element of claim 4 wherein said ultraviolet radiation absorbing compound is 2-(2'-hydroxy-3'-5'-ditert.-butylphenyl)-5-tert.-butyl-benzotriazole.
Claim 10
Dependent Claim
47 words
The photographic element of claims 1, 5, 6, 7, or 8 wherein said ultraviolet radiation absorbing compound is included within said at least one silver halide photographic emulsion layer and/or said auxiliary layer dissolved in small droplets of high-temperature boiling, substantially water immiscible, organic solvent dispersed therein.
Claim 11
Dependent Claim
51 words
An imaged and developed photographic element including a dye image characterized by having in the same layer as the dye image or in an auxiliary layer an ultraviolet radiation absorbing 2-(2'-hydroxyphenyl)-benzotriazole compound having two butyl groups attached to the 2'-hydroxyphenyl nucleus and a third butyl group attached to the benzotriazole nucleus.
Claim 12
Dependent Claim
51 words
An imaged and developed photographic element including a dye image characterized by having in the same layer as the dye image or in an auxiliary layer an ultraviolet radiation absorbing 2-(2'-hydroxyphenyl)-benzotriazole compound having two butyl groups attached to the 2'-hydroxyphenyl nucleus and a third butyl group attached to the benzotriazole nucleus.
Claim 13
Dependent Claim
44 words
The element of claim 10 wherein said ultraviolet radiation absorbing compound has said two butyl groups attached to the 3' and 5' positions of said 2'-hydroxyphenyl nucleus and said third butyl group attached to either the 5 or 6 position of said benzotriazole nucleus.
Claim 14
Dependent Claim
42 words
The photographic element of claims 1 and 4 wherein said ultraviolet radiation absorbing compound is present in at least one of said silver halide emulsion layer and said auxiliary layer in an amount of from 0.04 to 4 grams per square meter.
Claim 15
Dependent Claim
40 words
The photographic element of claim 9 wherein said ultraviolet radiation absorbing compound is present in at least one of said silver halide emulsion layer and said auxiliary layer in an amount of from 0.04 to 4 grams per square meter.
Claim 16
Dependent Claim
39 words
The element of claims 10 and 11 wherein said ultraviolet radiation absorbing compound is present in at least one of said dye image layer and said auxiliary layer in an amount from 0.04 to 4 grams per square meter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-05 | 1985-10-05 | 1986-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-05 | 1989-10-05 | 1990-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-05 | 1993-10-05 | 1994-04-06 | $7700.00 | Window Closed / Lapsed |